Notify Kerberos and Sentry do not take effect
Notify Kerberos and Sentry do not take effect

In the CDH plugin document, notify that Sentry service does not
really take effect, for Kerberos authentication is not enabled in
the cluster (need future implementation).

Closes-Bug: #1433407
Change-Id: I43665b394c81a2e3742ab2c31257f6ae7084b6be

tellesnobrega/sahara,zhangjunli177/sahara,esikachev/sahara-backup,openstack/sahara,openstack/sahara,crobby/sahara,bigfootproject/sahara,matips/iosr-2015,tellesnobrega/sahara,zhujzhuo/Sahara,ekasitk/sahara,henaras/sahara,ekasitk/sahara,egafford/sahara,redhat-openstack/sahara,bigfootproject/sahara,egafford/sahara,matips/iosr-2015,esikachev/sahara-backup,ekasitk/sahara,crobby/sahara,henaras/sahara,matips/iosr-2015,zhangjunli177/sahara,zhujzhuo/Sahara,bigfootproject/sahara,redhat-openstack/sahara,henaras/sahara,zhangjunli177/sahara,zhujzhuo/Sahara,crobby/sahara,esikachev/sahara-backup,redhat-openstack/sahara